My NRP used to be a sci-fi sandbox. There were your classic robots that wanted to wipe out life, that one species that wanted to wipe out technology, and there were railguns and lasers.

Now soldiers are sent into combat with weapons that destroy souls, there's a woman who is immune to pain because of magic, an entire species is powered by magitech, there's a steampunk hybrid of France and England, god made the universe out of bordeoom, and ended up starting a rebellion in the mid-21st century USA. With railgun arquebuses because, and I quote, "Why the hell not?".

How is this supernatural stuff justified?

We took the Standard Theory, shoved it in a blender, added multiple discredited theories, threw every single popular anything ever into that blender, left it on the highest setting overnight, laced it with multiple types of drugs, then served it as a giant blob of mush accompanied by a wine glass filled with Michio Kaku's tears.

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There's also another NRP I was in, which started out as a lightly sci-fi RP. Then cloaking devices became a thing, and they were answered with "MOAR EXPLOSHUNS" in the form of antimatter missiles. After about fifty-seven United Nation's buildings being blown up, WW8 began. One of the nations tired to blow up Madagascar with a space antiproton beam, but ended up destroying half of Africa, irradiating the Earth, and releasing an experimental bioweapon in Madagascar. Earth was doomed, but not doomed enough, so a nanovirus was released for the hell of it and everything on Earth died.

A hundred years later or so, KEpler 22-B is just one giant planet-sized city, the entire Sirius star system has been turned into a starship, and these two nations decide to go conquer the Sol system because Sirius wants Earth back and the Keplerians want Mars back (Blah blah blah, ancient aliens on Mars, giant war, caused the collapse of the magnetic field, anyways they want it back). By the end, Space Japan had a giant mech for the hell of it and the Keplerians had planet destroying bioships that can also lash out at other warships using giant tentacles of death.